How to start Node-Red with closed palette category

When you start Node-Red and access it from a browser, you will see the palette category expanded.

Is there a way to start with the palette category closed?

Idea /not tested/: You can add custom CSS and custom JS in settings.js to override editor theme.
Something like:

page: {
css: "/root/.node-red/custom.css",
scripts: "/root/.node-red/custom.js"

Then in theese files you can (probably) manipulate palette elements adding them to "pallette-closed" or "palette-open" classes. You can even hide "palette-base-category-..." elements and headers by settiing "display:none" in css .

Thank you for the advice. I'll give it a try.