When I land on the Suggested / Featured sites page in Office 365, how can I see ALL the sites that I have permission to access? All I see are suggested and frequent but that's not a full list of my sites?
There are three options: Highlighted Content web part, Content Search web part, and the Search Results web part. Which web part to use depends on the total number of sites a user has access to (e.g. 20 total or 500+ total), the level of customization needed to display as desired, etc. View the comparison matrix I use when determining which to use at https://jennyssharepointtips.wordpress.com/2019/08/18/display-a-list-of-all-sites-a-user-can-access.