Thumbnail Video cannot full in Gallery View on Windows PC

i find bug on my laptop, my laptop Device type is acer aspire R 13 Intel i7 6500U with Graphic card Intel HD 520 and using Zoom version : 6.0.4 (38135)

if i start zoom as a host or participant the video thumbnail from host or participant is not fully in the zoom windows when i'm using gallery view, can you help me to find out how to fix this issue?
here i also attach screenshoot from my zoom laptop

Screenshoot from my zoom workspace 
Thankyou