I have created subsites below my main SharePoint Online site, and I want to use the "modern" style to them (as their respective start page). No custom master page involved.
On clicking the logo top left, I am by default directed to the subsite itself, but I want to be directed to the main site again, like a Home link. This should be very simple. But what is the simplest way?
EDIT: I realize that I need to make an spfx extension or spfx webpart to accomplish this, for a "modern" page. Any guidance is welcome. Maybe something like the old script editor is the way to do it?