Add New product points

Hello,

Please can you answer me to several points regarding Add New product:

1. With Categories box some arrows do not match square marks (attached screenshot);

2. When spreading TinyMCE editor on whole screen, editor toolbar disappears from the screen;

3. How the buttons Insert shortcode and Insert WP User Avatar can be removed from editor?

4. I have one suggestions regarding adding product categories. It is very important for some sites
which have many categories and subcategories that adding categories be much more flexible.
So maybe you could make field for adding categories more wider and enable adding categories in some steps:
first showing main categories, then after choosing main category show its subcategories, etc.

Thank you