I don't understand exactly what you want to do with the top panel. You could try it first with gnome-tweaks (tab topbar) or you can install the extension manager and enable some gnome extensions to modify your taskbar, with "Dash to dock" or "Dash to panel".
Perhaps this extension is something for you:
A thread in Reddit about the extensions that are used to make a mac look:
https://www.reddit.com/r/unixporn/comments/txa1wv/gnome_if_youre_a_fan_of_mac_os_looks_and/
Or here a thread of Zorin: