RE: Lookup field in Modern Advanced Find Filter Criteria
Hi AndyArndt,
Unfortunately, the lookup column filter in Modern Advanced Find can't switch to specific view, which is by-design.
You can populate value and search, then it will be shown:

If you insist on getting the feature in the Modern Advanced Find, maybe you can create a new idea through the below URL, then ask your colleagues to raise up the votes.
Ideas (dynamics.com
Our product team has direct visibility of these ideas and they will implement it on the basis of the highest number of votes received.
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Or you can use old Advanced Find if you must need to select views when filter lookup column:
Go to Settings > Advanced Settings, then you click 'Advanced Find' button in current page, then you can get old Advanced Find window:
