Solved Sidebar Widget Heading

Good morning. When I created the sidebar on the home page - https://slhc.org.uk/ - I used H4 for the heading, not appreciating that when I use Page Speed Insights it objects to the idea that the main heading is H2 and the sidebar H4. I have tried everything I can think of to change it to H3 through the edit routines but no joy. According to the Help pages the heading line should appear as the first option but it doesn't. It is there if I make a brand new sidebar but not when I try to change the current one. Any ideas please?

 

That worked a treat, thanks. Small problem in that I don't have a child theme, everything is done on the master. I added the code to functions.php which solved the problem but obviously, every time we get a Divi update I will lose the code. I can easily save the code and re-add it but I wondered if there was any way it could be added in a permanent way. Otherwise I guess I will have to learn all about child themes and how to use them!

 

Thanks for the plugin advice. Had a quick look and seems quite straightforward. I've saved your code, given it a name and presumably run it every time there is a Divi update.
I have another question about functions.php but it is not directly related to this query so I will start a new thread.

 

I thought I would finish off this thread by thanking you for your advice about the plugin. I deleted my original edit and used it to make the changes. Works a treat. I also found another snippet that changes the viewport meta which I have been amending after each Divi change. The snippet now removes the original line and replaces it with the update. Saved me learning how to create a child theme!