Winecfg: "Enable GTK3 Theming" is grayed out

I cannot check Enable GTK3 Theming as it is grayed out. How can I enable it?

wine-6.0 (Staging)
inxi -Fxxxza


$ pacman -Si wine-staging
Repository      : multilib
Name            : wine-staging
Version         : 6.0-1
Optional Deps   : giflib
Validated By    : MD5 Sum  SHA-256 Sum  Signature

Do you have both gtk3 and lib32-gtk3 installed?

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Yes, all the Optional Deps you mentioned here.

OK, so before I install wine-staging and do a web search, what have you already looked at or tried before asking here?


I didn't do any tweak to Wine. I just read it here but didn't understand the last post ( 2021-01-13 19:24:02)

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I've had a look and it just doesn't seem to work. It might be a bug in wine-staging or something missing from the packaging process...

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