DNDBeyond DM Screen AboveVTT Dice Symbol is gone.

In the bottom left corner, D20 symbol is gone. When i entered into one of my player sheet, it is appearing. 

In AboveVTT, that blue dice is gone. How may i make it appear it? 

AboveVTT is a third-party extension, not a D&D Beyond product. If you need help with it, you'll probably have better luck via whatever support mechanism AboveVTT itself has.

how we can get to them i cannot find anythin

Quote from Gnoxie >>

how we can get to them i cannot find anythin

 Check the AboveVTT subreddit, they have a link in their description to their support Discord.