I’ve just noticed that two of my sites on the Vantage theme (Free 1.11) that WERE full-width are now narrow. The only thing that I think I’ve done recently is to change from PHP 5.6 to PHP 7.2. Would that have any connection to this? Here are the sites:
Strangely, another site, also on Vantage 1.11 remains full-width:
All 3 sites are part of a single multi-site.
Any insight you might have would be helpful!