For pop-up and conref
Note. To switch to the full version of Yandex.Mail, tap Full version in the lower left corner of the page. To return to Yandex.Mail for mobile, tap Light version at bottom of the page.
Note. To switch to the full version of Yandex.Mail, tap the
button in the upper left corner of the screen and then, on the page that opens, the Full version button at the bottom of the page. To return to the mobile version, tap Light version at the bottom of the page.

Open the message.
Select the messages. To select a message, tap on the sender's avatar in the message bar.