Spacing options locked/greyed out...?
I upgraded to InDesign 2019 and have an odd problem I never had before: every now and then the spacing option to align objects is suddenly locked:

Sometimes the option because editable again but at this moment I am stuck because I can't select and/or change either option (Afstand gebruiken)! I never ever had this in previous versions of InDesign where these options were ALWAYS available. Is this something new in ID 2019...? How can I unlock and use these options again? I need that option badly but can't use it at all right now!
