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Generally, it is not necessary to do anything else. You can select first “Browse” select the path, then “save” it (which means to copy that selected path to the line in the exclusions list, and then click on “add” down the Avast page. Then save the settings (click “OK” on the right lower corner of the settings / exclusions page).
Then try to confirm if the setting was saved by opening again the same specific scan → settings → Exclusions.