Since navigation through the chat window is difficult, as at the moment it is carried out exclusively with the mouse cursor, which leaves much to be desired.
And the scrollbar is also not convenient to use with the cursor, need to aim for a long time.
Optimisation of the ui is always in progress
If you manage to select the chat window, such as clicking on the More options button for a message and then tapping on an empty space in the chat, you can scroll through the screen with the up and down arrow keys.