IMO, your improvements make the user experience much worse. The current version is far more space efficient, your new versions wastes giant amounts of screen space.

* There is no super-wide list of relays that doesn't fit even into Tor Browser window (panels instead with upstatus indication)

The important stuff does fit, usually no scrolling is required.

* Updated navigation bar with new version of Bootstrap

Takes up more space with no usability improvement.

* Stretching of the graphs

They disappear with TBB set to high security.

P.S. Some of functions like list sorting, display range, detailed search and maybe more are broken/gone now. I'm wondering if these functions are useful?

Yes, they are useful.