Dynamic configuration of communication video stream arrangements based on an aspect ratio of an available display area

The provided techniques improve user engagement and more efficient use of computing resources by dynamically configuring video stream arrangements based on an aspect ratio of an available display area and a target aspect ratio. Such techniques provide dynamically optimized user interface arrangements that accommodate any given shape of an available display area. The techniques can also help viewers maintain focus on the salient content of a multi-stream display when users resize a display window, move a window to a random shape, rotate a device, join a communication session, leave a communication session, present content streams, remove content streams, etc. A target aspect ratio can be utilized in a process to recursively divide a display area horizontally or vertically to accommodate any number of stream renderings. An adjustment of the target aspect can allow for an optimal display any number of video stream renderings for any shape of a display screen.