How to select (and know you've selected) the correct citation style

edited November 11, 2020
Over and over, I go into zotero>preferences>cite>style manager and choose APA 7th edition. Initially, the choose is highlighted. I click out of preferences, add my in-text citation, and it is wrong (e.g. no comma between author and date; using and instead of & between 2 authors). So, obviously, somewhere along the way, APA 7th was not selected.

How do I go back and select it for the 10 citations I've added to my folder? Or, how do I confirm what citation style is actually being used? Each time I go back to preferences>cite>style manager, my choose of APA 7th is no longer highlighted. Please help.
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