Minecraft v1.16.4
Sophisticated Backpacks v1.0.0.9
Quark r2.4-279

Quark also adds sort buttons to the inventory. Could a config be added to offset the buttons from this mod to a different location?

Oddly, for me the Quark sort buttons actually move over to the left to give room for the new SB buttons, so I wonder if there's already compatibility code in place that's just not triggering for you?

Hmm, I am using the mods on a server. Maybe that's why?

I can actually see that as well. it doesn't happen for diamond backpack as that uses wide inventory texture. but it does happen for all the other backpacks

I did only check one backpack size.

Ah, yep, I was using the diamond backpack.

Alright, thanks!

In the latest version you now have client config to set where the buttons should appear - there are 4 different places so that should hopefully be plenty to avoid this conflict