why the theme is using 3 different set of icons:
I’m using maybe 10 icons. Is it possible to turn off 2 sets of icons and stay with one only (and use icons only from this set)?
I hope you are well today and thank you for your question.
Each one provides a different style of icons and some are unique so there are no direct replacements for them.
You can develop custom code and configure specific set of icons in the element settings to use only one type of icons.