Thank you for your post!
Are you doing the Perform Find for a particular field or doing a Quick Find (searches all fields)?
You might see Performing Find and Refining find requests in FileMaker Pro using find operators.
I'm going to move this thread from the FileMaker Community Feedback Space (which is specifically for input on the Community itself) to the Discussions Space where you should receive more views and potentially more feedback on this topic!
You seem to use the search box at top right, instead of doing a search by entering find mode.
You can exclude all your fields on the layout from QuickFind, except the checkbox field (I would not recommend that) or enter find mode and click the wanted values in the checkbox field.