New page cannot be eddeted

Hi

New to Gantry5. How to add new page CORRECTLY?

I have added new page in WP Dashboard (page address http://soundlineagency.ru/vr1/), added it to Menu (in WP admin), in Gantry Admin created new Outline by duplicating “Home-particle” and assigned Title “vr1”. Strangely, the resulting page has Base outline. Moreover, I cannot change Styles and Layout of the page; meanwhile, all other pages that came with Helium theme are editable just fine. I tried variations of creating new Outline with the same result.

I have fresh install of WordPress + Gantry + Helium Theme: helium-5.4.36-rocketlauncher_j39.zip

Thanks

The page I need help with: [log in to see the link]