There are different ideas on this. Google read your page mainly through your HTML code, so if you view the source code of the page and the content is visible in text form, then you're in good shape.

There are different opinions on how much Google takes into account expanding accordion and tab-like structures where the content is hidden but also fairly accessible to the user.

Even though this is from 2014, it does state that there is a fair amount of discounting going on - https://www.seroundtable.com/google-hidden-tab-content-seo-19489.html