You need to go into /davinciresolve/preferences/playbacksettings and uncheck "optimized sizing". It's a bug that has been there for a long time and it's doing the exact opposite of optimizing sizing.
wOW, i had the same problem just now, and this solution isn't even suggested in the blackmagic forums.
Alpha graphics jagged edges in DaVinci Resolve
in DaVinci Resolve
wOW, i had the same problem just now, and this solution isn't even suggested in the blackmagic forums.
Thank you, Abby!!