Add-in adds the "Timeline" panel to the "Utilities" toolbar. By default, only three essential commands are promoted to the panel, others are available in the dropdown menu. You can promote commands to the panel using the item's menu.

Below is the list of available commands. Note that no command alters the actual list of items (items aren't deleted nor added), only their grouping.

Group items

Create a new group(s) with selected items. While this is already possible using the built-in "Create group" command, it is here for convenience. Also, the behavior slightly differs: in contrast to the built-in command, which is not available when selected items are not consecutive, this command creates a group from every run of consecutive items.

Ungroup items

Ungroups all selected groups and all groups containing selected items. The contents of groups are preserved.

Split group

Split existing groups into smaller ones at the points just before selected items.

Move to the right group

Puts selected items (they must be selected in a row) to the group right after them.

Move to the left group

Puts selected items (they must be selected in a row) to the group right before them.

Extend group right

Extends the group containing selected item one item to the right i.e. item to the right of the group is moved into the group.

Extend group left

Extends the group containing selected item one item to the left i.e. item to the left of the group is moved into the group.

Contract group right

Contract group containing selected item one item on the right i.e. right-most item of the group is moved out of the group.

Contract group left

Contract group containing selected item one item on the left i.e. left-most item of the group is moved out of the group.

Expand groups

Expands all selected groups.

Collapse groups

Collapse groups containing selected items.

Expand all groups

Expands all existing groups.

Collapse all groups

Collapses all existing groups.

The installer that ran when you downloaded this app/plug-in from the Autodesk App Store will start installing the app/plug-in. Or, simply double-click the downloaded installer to install the app/plugin.

Uninstall:
You can unload the add-in without uninstalling it by clicking the "Stop" button when the add-in is selected in the list box on the "Add-Ins" tab of the "Scripts and Add-Ins" dialog.
Unchecking "Run on Startup" causes the add-in not to be loaded in future sessions of Autodesk® Fusion®.
To uninstall this plug-in, exit the Autodesk product if you are currently running it, simply rerun the installer, and select the "Uninstall" button.
Or, you can uninstall it from 'Control Panel/Programs and Features' (Windows 10/11), just as you would uninstall any other application from your system.