Ah, that drill-down/accordion menu in the Azure Blue skin. I don't think you can change that behaviour through the interface. Do check all the options in the output preset and the skin for anything that looks relevant though. And as Jeff suggested, check the other Responsive skins to see if they behave differently. Additionally, Frameless output is more configurable, so you could look at changing your output type if one of the frameless skins works the way you want, or has a configuration option for that behaviour.
If you can't find anything any of those locations, you could try changing a setting in the output - this change would need to be made every time you generate however. (If you have a friendly developer, should be able to set it up as a Post-Generation Script in the output preset.)
I don't have access to RH2022 right now, but in the output, look for a "usersettings.js" file. Open it in a text editor and look for the line
model.publish(rh.consts("KEY_MOBILE_TOC_DRILL_DOWN"), true);
Change 'true' to 'false'.
If that exists in RH2022, then the output should now use the expanding toc rather than drilldown.
(You could also turn off the Responsive setting in the skin, but that changes the toc display to something rather inconvenient and confusing on mobile.)
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