When editing any client/reseller limits, if you select a custom-made template (so any template that has been created and/or customized, that is NOT the custom template...), to reduce confusion I suggest to hide the limit screens. This could perhaps be achieved even with a simple CSS rule: .panel-group#accordion { display:none; }, or similar applied to the correct page. Just a thought?
Could you please file a feature request for this (if not already existing) at https://git.ispconfig.org/ispconfig/ispconfig3/issues ?
