In Directory Opus 13.10 and later, Power Mode commands on the toolbar and menus are hidden by default (unless you're actually already in Power Mode).
We found that many users would accidentally enter Power Mode without realising (or without even knowing that it IS a separate mode), and would then get confused by the different behaviors.
If you want to continue to make use of Power Mode, simply turn on Preferences / File Display Modes / Power Mode / Display Power mode toolbar buttons to restore the buttons.