We're excited to announce Split Panes, the newest member of Frames. This layout pattern allows users to create a resizable and scrollable frame, with a custom width, alongside the main canvas. You can add a Split Pane frame from the Frames section, or drag it onto the canvas from the Component Tree.
Split Pane is rolling out on Retool Cloud this week. As always, feel free to add feedback or feature requests in this thread!