The Bootstrap class .mb-4 is being applied to the tag by default, which is setting the margin.
If you wanted to set the margin on all the h6’s without removing the spacing each time, you could target with selectors, but since the Class Manager decides to turn the h6 tag to a class when doing this, you have to add this to the code editor instead. (which also means you do not see it on the design canvas.)
This is not the ideal way to do it, but it’s the usual work around… roundabouts. Really you just want to change the spacing in the side panel. Ideally we would have robust theme options like a lot of other apps to set all this up globally.
h6.mb-4 {margin-bottom: 0!important;}
The X button should remove all the spacing classes, but it doesn’t. Weird. go figure.
EDIT
Actually you can do it in the class editor, but lets use the .bloc class to stop the h6 tag changing… so do this… (preserve the space after .bloc)
GREAT it works perfect. Thank you very much. I’ll have a massive gain of clicks (several basic templates), especially with the fact that you have to go each time for each Hn to smallest responsive size to define the value to get it universal, for each Hn… ( Personnaly don’t understand at all this approach, why not only the default largest size until changes in others responsive sizes, btw. )
Gonna look with your eplanation which variants for others Hn.