Is CDN switcher working?

Hello,

I discovered with an online tool for optimization of a website loading time that the bootstrap css file is being loaded from the host rather than from a CDN. The Settings > CDN has a lock and there are no custom imported/modified theme, I use default one. But also in the Export settings the "use CDN" switcher is ON. And if I open the

<

header> link then it will show the corresponding CSS file without pointing to external server (though as I understand it does not matter). Anyway please see the screenshot that on the actually published website it is not replaced with a CDN link.

The templates in Bootstrap Studio (everything except blank) use a modified bootstrap css files to incorporate the changes in the theme. This is the recommended way to customize Bootstrap, but unfortunately means that a CDN can't be used, as the file differs from the regular bootstrap one.