Ok. I think that second issue with mobile is solved. The only problem is that you must remove some menu items because not enough space for button https://monosnap.com/file/MfG5FyCijr8rGj3iYL8Kr6aHv05kO0

Unfortunately there is another issue now with Elementor style loading. What you can try is to use Cache parameter of header template. To be truth, we strongly not recommending to use Elementor custom header in current point. Elementor produces huge amount of code and very slow. Not a problem when you use it on one page. Huge problem when you make it for global elements. We are working on special template system based on Gutenberg. It will be very fast and bug free. It will be available with 5.9 of Wordpress (December). 

In current point, I recommend to use header layouts without Elementor. Theme options - header options - header layout and enable Menu + logo in one row. It has menu and all buttons including cart, login.Please, use it until we introduce new Gutenberg template system

Of course my Russian friend, but the problem is still there.

You can use custom header but you must use theme menu elements as mentioned
in video

Пт, 12 нояб. 2021 г. в 03:31, Sizam Support Help Desk <
sizamtheme+M3VYb794zkPDj2dDy0Z8@mail.support-hub.io>:

I've changed the menu and searched by theme's elements, which is better than before, but it still has the problem, that I mentioned before.

I tried the default header, and it doesn't cause any problem.

So the customizable header is impossible to create, what are the other ways to do it? I just bought this theme 2 days ago, and the instructions show me to use ELEMENTS to create a header and footer.

I have no ideas to customize the header by default theme, I want a solution.

first of all, you need to remove Elementor search and menu and use theme's elements for these parts. Theme has both menu and search. Please, replace them first. And we strongly don't recommend to use Elementor header builder if you want to keep speed on site

The second problem is in MOBILE phone way.

If you go to my website via mobile phone and use the menu go shop page, then if you try to open the menu, its not working any more, the info is not dropdown.

I've changed the header by elements customized. 

I followed the video to close the header and add code to ADS.

Then the problem is happened, which is:

when i click pages from everything, the loading should be like a circle, but the loading icon is changed, its like an animation, I CANNOT EXPLAIN IT, BECAUSE ITS HARD TO SAY IT WITH WORDS.

I attached the video, please check it and get me back!!!!!!