The volume level is no longer displayed on the TV screen when I change the volume using the soundbar remote control.

In some software versions, an improvement was introduced so that the volume level would also be displayed on the TV screen when the soundbar volume was changed.
However, it was later found that, in environments where certain external devices (STBs) are connected, the volume display could appear even during operations unrelated to volume control. Therefore, the latest software has reverted to the previous behavior.

Note:  When the soundbar volume is controlled via CEC using the TV remote control, the volume level is displayed.