I'm seeing a second pair of (really squashed) OK and Cancel buttons at the very bottom of the ZPlayer Options window accessible via:

Settings->Options->More Options

Code:
ZC Player, Version 2.55
Nightly (Alpha 119/120)
Build Date: 3rd February, 2024 at @ 07:17:57 EST
Built By: UNSIGNED
Tag: 2.55.0 Nightly (Alpha 119/120)