There was an update to Power BI that was deployed 08/24/2022 and you can no longer control inclusion in Apps from the main screen.
The column is still there so you can see if a report is included in the app, but you can't change it there anymore. The new steps are this:
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Click on Update App, to get into the Update App configuration screen.
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Click on step 2. Content and then Add content. Add the new report to the Content list below.
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Click on step 3. Audience and make sure the newly added report is not hidden (it seems to be marked as hidden by default).
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Publish the app. The new report will now appear in the app.