Increase size of workarea on SPFX Workbench.aspx

No, just download the code from the repository that I linked. 

Run: npm install, gulp bundle --ship, gulp package-solution --ship. 

Upload the package to the app catalog and add the web part to your workbench page 🙂 The web part will be on the page together with your solution, but it's completely isolated

Let me know if you have any questions. If the instructions on the readme file of the solution are not clear, I would appreciate feedback so I can update them