(Configured via Preferences / Folder Tree / Contents.)
Root items in the folder tree can be rearranged or turned off.
Individual folders under the Profile directory can be shown or hidden.
Windows 11: Opus now filters out the plethora of random folders Microsoft added under Desktop. A new option lets you add them back.
Option to hide non-drives under This PC. (Will only show drive letters and MTP devices, no "media" devices.)
Option to show only labels for drives.
Option to show full paths for Smart Favorites.
The user profile folder (normally your user name) is now displayed as "Profile" by default. It can be changed back if you wish.
Support for Linux virtual folder \\wsl$\ when present on supported Windows versions. Can be hidden if not wanted.
New option, "Remove dynamically added folders". When on, root folders that were added dynamically (to show a branch that is normally hidden) are removed again when you navigate away. When off, they stay until the window closes.
Changes to the Quick Access folder are now reflected sooner in the folder tree (and on toolbars, if the folder has been added to them).
The Favorites branch now supports separators in the tree.
Removed the "Start Desktop at…" dropdown. This confused people, and most of what it did can now be achieved in other ways. For example, This PC can be moved to a separate group, which is similar to the "start at Computer" option, and "non-drive folders" can be turned off, which is similar to the "start at Drives" option.
Network servers:
The Network branch now updates automatically when machines come and go (as long as Windows itself notices).
The list of computers under Network in the folder tree is now cached for faster access, including across restarts.
Caching can be configured under Preferences / Folders / Network Folders.
You can also specify one or more servers which should always be listed, even if Windows fails to find them.
Cloud storage:
Option to put Cloud Storage folders in their own part of the tree, or hide them entirely.
Synology shares are now shown properly in the tree (and on the Desktop) as links directly to the share folder, rather than the intermediate folder containing shortcuts.
Expansion and pinned branches:
(Configured via Preferences / Folder Tree / Expand/Collapse.)
Tree header has new "collapse all" button. Collapses all folders except those leading to the current path.
Tree header has new button to manage expansion presets:
Save a list of which folders are expanded and collapsed into a named preset.
Load a preset to expand and collapses folders to match what was saved.
Use multiple presets for different situations.
New option, "Expansion pins on folder tree branches":
Pinned branches remain expanded and cannot be collapsed. They remain expanded when you click the "collapse all" button.
Expansion pins, if enabled, display on mouseover, on the right of each branch.
Click pin once to pin a folder and again to un-pin it.
Ctrl+Space toggles the selected branch's pin, if the tree has keyboard focus.
New option to remember the expansion state of all tree items (not just the root items as in Opus 12).
New option to remember the expansion state of root items. (Opus 12 always did this; now it's optional.)
New option to only remember expansion state of pinned items.
Tree branches now animate briefly when expanded by mouse or keyboard. New option, "Animate expanding branches" to turn it off.
The old "Expand My Computer branch" option has been removed, since the state of all folders is remembered automatically.
Miscellaneous:
Tree item height, indentation and spacing are now configurable.
New option to prevent scrolling when branches expand. (Stops the tree jumping down to show as much of the expanded branch as possible.)
"Position selected item" setting has a new "25% from the top of the tree" option, in addition to the older "top" and "middle" choices.
New option show or hide the tree header's lock button. (Off by default. People tended to click it without understanding what it did.)
You can now create hotkeys which only apply when the folder tree has focus.
Commands:
Go TREEEXPAND=... and Go TREECOLLAPSE=... – Expand or collapse multiple tree branches in various ways. Parameters include:
"focus": Expand/collapse the tree item with input focus.
"all": Expand/collapse the current branch and everything within it.
"first": Expand/collapse the current branch only.
"second": Expand/collapse current branch on first use, then expand/collapse all its children on second use.
(The old Go EXPANDTREE is hidden, but still works. Go TREEXPAND with no additional parameters does the same thing.)
Go REMEMBERTREEEXPANSION and Go RESTORETREEEXPANSION – Save and load which tree items are expanded and collapsed.
NAME argument can specify preset to load or save.
If no preset is specified, expansin state is stored in memory temporarily until the window closes.
Go RESTORETREEEXPANSION=list – Displays a list of saved presets which you can load. (You'd normally access this via the tree header, but that can be hidden.)
Go RESTORETREEEXPANSION=reset – Reset tree expansion to its initial state.
Go TREESETPINSTATE – Toggles the selected item's pin.