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Folder Sync can terrify you by showing a blank screen:
BC thinks you don't want to see the files that don't need syncing (e.g. files that are already up to date on both sides), so it hides them. To unhide those files, press
Other than Folder Sync, you don't have to worry about Peek in the beginning until you start using filters.
Dot files, shown in a Folder Compare session
If you don't want to see files that begin with dot (1) you can set a filter with Session->SessionSettings->NameFilters. Set the filter to Exclude files matching the pattern of "dot anything", in other words .*. Star means wildcard here, similar to DOS/JS language. But now you can use use
Peek to toggle the filter on and off.