Is there a simple way to achieve full-width show for a selected page (without sidebars) ?

Gleb

Yes there is :
Sidebar ->Left/Right sidebar->Don't Display on....




Gleb

Yes, see Sidebars -> LEFT sidebar: Don't display on Pages: / RIGHT sidebar: Don't display on Pages:

Edit: We posted at the same time...

Ok, I'm getting better with your theme, I think.

It's going to replace old one at my membership plugin site:
memberwing.com

Took me whole day to grasp it's powers - thanks for the great work and excellent tech support.

Gleb