Canon EOS R50 Advanced User's Manual page 210

Note
[ : Highlight tone priority] is set to [Enable] and cannot be changed after you
set [ : HDR shooting
a checkmark to this setting.
[ : Highlight tone priority] is set to [Disable] when [
[On], even if you set [
] to [Enable] by pressing the <
: HDR shooting
210
> button to add
: HDR Mode] is set to
] to [Enable].