Add Workspace Switcher by default because if you open TBB and then open file manager and then press/hold the file manager top bar and go left of the screen then TBB page will disappear. it didnt disappear actually but the file manager window went to a new workspace. and in order to see all the work spaces you need to add workspace switcher plugin to the taskbar by default.
right click on the taskbar -> go to Panel -> Add New Items -> Workspace Switcher
then move the workspace switcher near to the browser icon (left) for better control.