Audio waveform disappeared.

It used to show and now it's gone. The same files, the same locations of files, the same location of CacheClip, no multicam, "Show Audio Waveforms" is checked ON, - i haven't changed anything from the moment it worked. I can see the waveforms on Fairlight page, but not on Edit page. Rebooting doesn't help.
I read a lot of topics on that and yet i don't know what to do. It seems that DR has a wrong approach to such an easy and helpful thing as forming waveforms, and people have been struggling with that for years. How can it be that it works at one page and it doesn't at another (fairlight and edit accordingly)?
Thanks.
DR version is 15.2.2

Attempt to adjust the TL option or Reset UI (workspace menu option)

TL-OPT.jpg

Jean, thanks A LOT!

In fact what matters in my case is not the pictogram you marked, but on the next line (Timeline View Options) the third one (on the very right). It turns out that when i use the smallest Clip View Options (next line on the right), and than turn it back even to biggest one (on the left the same bottom line), i have to check that pictogram ON again. Every time you chose the smallest view in the Clip Options and than switch back to the biggest one, you have to push that audio button again.
So thank you very very much!