Hi Hikaru Okada,
If you don't want to see Pending Checkins Windows popup, you can uncheck
perform backround status updates under
Tools > Options > Source Control > Plug-in Settings. This Option automatically updates the source control signal icons in Solution Explorer as an item's status changes. So unchecking this option will stop automatically updating the source control signal icons.
For your reference, please see this thread:
Is it possible to disable "Updating Pending Checkins"
Best Regards,
Nancy
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