Thanks for studying my request. I do not want to prevent users from booking multiple rooms. I found a CSS solution, but it may habe unexpected drawbacks. I put this code in the css/custom.css : .ui-resizable .ui-resizable-handle.ui-resizable-s, .ui-resizable .ui-resizable-handle.ui-resizable-n, .ui-resizable .ui-resizable-handle.ui-resizable-se, .ui-resizable .ui-resizable-handle.ui-resizable-ne, .ui-resizable .ui-resizable-handle.ui-resizable-sw, .ui-resizable .ui-resizable-handle.ui-resizable-nw...