This is a known issue which is currently being worked upon by AEM Development team under internal ticket ID -- GRANITE-30226. This is specifically seen with browser - Google Chrome(83.0.4103.61). You could test this on any other browser and it should work fine for the time being.
This has been fixed for AEM 18.104.22.168 (Releasing on Sept 3rd, 2020) & AEM 22.214.171.124. [NPR-33714], I hope this would help your concern. 🙂