How to exclude posts with multiple categories / multiple conditions

Hello, I’m using this plugin and it’s working correctly.
Recently I came across a particular condition:
Let’s say I set a fixed widget that is shown for posts belonging to category A and another widget that is shown on posts belonging to category B.
I also have some posts that need to be both part of categories A and B: this cause both widgets to be shown but they are bigger than the page height (and not really relevant in this case) so I would like to hide all widgets on pages that belong to multiple categories.

Is there any way to set multiple conditions (show if category A but not category B) or achieve this result (hide both of them)?

Thank you very much for your help,
best regards