[Request] Choose between Square and Rectangle when Staggered not available

[l2eused]

Add option in Preview Display to choosing square or rectangle while using staggered and it not available

tbc; for now, app using rectangle style when staggered not available. allow user to prefer square than rectangle.

[NANI-SORE]

Ok, I'll add in the next release a setting to select type of grid to fallback to if staggered is not available