I agree, I've expanded everything including the little avatars of the forums, try to inject this code, if you do not like to delete it. Tell me what you think.

/****increase avatars*****/
/************************/
/* Size avatars 4rem */
.bx-def-thumb-size {
width: 64px;
width: 4rem;
height: 64px;
height: 4rem;
line-height: 64px;
line-height: 4rem;
}
/* Height Notifications*/
.bx-def-thumb-size-min-height {
min-height: 64px;
min-height: 4rem;
}
/*Margin timeline*/
div.bx-tl-item div.bx-tl-owner-name {
padding-left: 0.3125rem;
}
/*interligne reply*/
.bx-base-general-unit-meta ul.bx-menu-custom.bx-menu-hor > li > span {
padding-top: 10px;
}
/*Margin notifications*/
.bx-def-thumb-size-left-indent {
margin-left: 5rem;
}
/*Margin messenger*/
.bx-messenger-jots-info {
padding-left: 1.25rem;
}
/*Width avatars messenger*/
.bx-messenger-jots-avatars {
width: 4rem;
}
/*Size avatar menu member */
.bx-def-icon-size {
width: 48px;
width: 3rem;
height: 48px;
height: 3rem;
}
/*END*/
/****forums increase avatars*****/
/*Size micro-avatars*/
.bx-forum-grid-preview .bx-forum-gp-meta.bx-forum-gpm-bottom .bx-forum-gpm-reply .bx-menu-item-reply-author .bx-def-icon-size {
width: 2rem;
height: 2rem;
margin-top: -0.25rem;
}
/*margin grid forum*/
.bx-forum-grid-preview .bx-forum-gp-meta.bx-forum-gpm-bottom .bx-forum-gpm-reply .bx-menu-item-reply-author .bx-def-icon-size-left-indent {

margin-left: 2.5rem;
}
/*Margin micro-avatar*/
.sys-author ul.bx-menu-custom.bx-menu-hor > li > span, .bx-base-general-unit-meta ul.bx-menu-custom.bx-menu-hor > li > span {
margin-bottom: 1rem;
}
/*increase micro-avatars messenger*/
.bx-messenger-jots-title div.view img {
height: 150%;
margin-top: -5px;
}
/*end*/