on the site at any shire there is a gray zone. as in the screenshot. The smaller the screen width, the greater this gray area. in the mobile version, the gray zone occupies more than half the space. site- sky-country.com.ua
Deactivating the “PHP Code Widget” plugin, solved the issue you had. https://prnt.sc/iqhxqh
So I suggest you check the codes you have added with that plugin or simply live the plugin deactivated if you don’t need it.
I also noticed that you are using too many plugins.
Having too many plugins activated at the same time is a good recipe for disaster.