I need more than 80mv/div sensitivity ,increasing R7 would help ?Don t care too much abut acuracy ,just need to sniff some lower signals
Thank you !

To get a 100x increase in the gain:
1) Swap R2 (820K) and R3 (180K)./\r\n/2) Replace R7 (20K) with 110K/\r\n/3) Replace R8 (180K) with 4.7K
To understand how to calculate the gain:/\r\n/ XScopes Analog Front End