I installed Qt5 via homebrew, but I didn\'t find the designer. I also installed qtcreator (Caskroom/cask/qt-creator) but the designer icon is grayed out:
Caskroom/cask/qt-creator
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If you double-click on a .ui-File (within Creator), the Designer will become active.
Or you need to add a Qt-Designer-Form with the wizard if you have no ui file yet.
otherise you can open Qt Designer alone (not inside Qt Creator) by doing open -a Designer
open -a Designer