Notes and Domino 14 EAP drop 2 is here and one feature has been added we are all waiting for, for decades: drag and re-order your workspace tabs.
Downside: this only works with the vertical (new) workspace tabs, not with the legacy horizontal ones 
However, if you want to re-organize your tabs, use the vertical display, re-order and then switch back to the legacy-workspace - and you're done.
How to
To switch back and forth the new and old workspace style, use this notes.ini option:
Workspace_Navigator=1 (new style)
Workspace_Navigator=0 (old style)