Just managed to do it with CSS custom below :
._retool-TableWidget .cell-container {
font-size: 10px!important;
overflow-wrap: break-word!important;
}
._retool-TableWidget .rt-column-header-name {
font-size: 10px!important;
}
._retool-TableWidget .rt-th.rthfc-th-fixed.rthfc-th-fixed-left.rt-resizable-header.-cursor-pointer {
overflow-wrap: break-word!important;
}
._retool-TableWidget .rt-th.rt-resizable-header.-cursor-pointer {
overflow-wrap: break-word!important;
}
However and as you mention it is not working for column name. As my column names are a bit long , do you know if it is possible to add a n overhead line / kind of categories / Top level headers ?