I am happy to report that Bootstrap Studio 4.2.0 was just released! For this version we've updated the UI, so that you can collapse your panels and easily resize the canvas with your mouse. This makes development more comfortable, and speeds up switching between screen sizes.
If you notice any bugs be sure to report them. We will be updating the new UI according to your feedback.
We will release a number of 4.2.X releases in the next few weeks.