Squarespace has quickly become THE WORST online platform to build a website. I've tried to steer many people towards Wix which allows unfiltered customization without code. It's completely ridiculous to expect paying customers to know code if they want to customize their site on a site building platform.
Want to change something on mobile but not desktop? Use Wix. Want to change a single font that is not part of your theme? Use Wix. Want to have a hover function on a sub nav? Use Wix. Want to do literally anything outside the realm of a strict template? USE WIX.
Every single one of these issues is a single click away on Wix. On Squarespace it is a matter of Googling your problem (not to mention you have to have know the specific terminology for your problem), find your code that is specific to someone else's site, download an extension to find out a block-id number, enter in custom code, see that the custom code fails, repeat steps until you find code that works. All for the simple fix of what — changing a font size? Making a gallery show three images instead of two on mobile? If these changes aren't a single click away then what is the point of offering a web building platform?
And no, Squarespace does not help at all with these problems, you rely on a completely user based forum for the entirety of your website to function. What a joke. I will steer every client to Wix.