How created permalink on Wordpress with category or tag page on Wordpress

Question 1:

I would like to know if it's possible, with plugin : "Pages with category and tag", to use the category page with custom permalink in setting on Wordpress ?

For example:

Actualy I use the postname permalink but I would like to use custom permalink with this structure : https://example.com/category/postname.

Question 2 :

Can you confirm me that %category% does not refer to Category Base in option of permalink ?

Question 3 :

To finish, when I want to change the type of permalink (postname to custom) and save the changment with my custom structure, the permalink not run automaticly. I see on one forum a answer said it's possible we don't have possibility of changment, it's true ??

Thank you everybody by advanced for your answers.

Good day !

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