How to enable Yandex.Collections in mobile Yandex.Browser?

Question

Yandex browser

In short, I give up. How to enable Yandex.Collections in the mobile Yandex.Browser? So that they appear on the scoreboard with a swipe down?
Previously, too, somehow, after half an hour of digging, it was possible to turn it on, now - nothing.
Xiaomi Mi A2 Lite, bare Android 9, everything and everything sync is enabled in the browser. The phone has other Yandex applications installed using different accounts, I tried to delete everything and install only the browser - it did not help. Yandex account spins on its own domain, but last time it didn't stop me.