Yes, ReadyAPI has never been changed to make it remember people's setups. This is in related to any pane or dialog. Compare this to most other IDEs, such as Eclipse, QTP, IntelliJ, which remember how you have adjusted all or almost all, of your panes and which items you may have enabled/disabled, etc.
Examples of things that you can resize in Ready API, but that it doesn't remember between restarts (this is not exhaustive):
1. The width of your Navigation Pane
2. The height of the properties sub-pane inside the Navigation pane
3. The size of the xpath assertion dialog
4. The details pane for services in Service V area (fyi, the Service V area needs a LOT of UI work, a lot of the choices that were made for the ReadyAPI re-work of this really waste loads of space)
5. The areas that a couple people mentioned in comments
Etc.
