Hello

After the update to 3.21 from 3.205 (same for update to 3.207) i have Picture of users very small in module who's online

Hi Arnaud,

for that module we using fluid CSS, no matter the container size the image will follow the ratio to fit 3 images per line.
to changing it you must make override template for that module. please follow this steps:
1. copy default.php from /modules/mod_community_whosonline/tmpl to /templates/yoo_drive/html/mod_community_whosonline/ create the folder first if not exist.
2. edit that copied file, at line 18:

From
<div class="js-col4 bottom-gap">

To
<div class="js-col12 bottom-gap">

Many thanks
Works Fine now!!