CSS Merge action, or minimise the number of separate CSS files

Hi

I'd like to know how to minimise or merge the amount of CSS files from the Bootstrap Project file I'm finalising. Currently I have over 15 CSS files from various components that I've used from the bootstrap components pane. Each time I use a block component i.e.: "features-clean", a new CSS file seems to be created. Isn't it best practice to have as few as possible?

How do I do this please?

Thanks MattHM

(sorry for the repost, but my previous message did not appear in the forum)

Isn’t it best practice to have as few as possible?

That's not important anymore, at least if your server uses http/2