I have a problem in the administration, the layouts are not displayed anymore when there are 5 created! what is the solution
I would first recommend checking the location you have set as the CMS Library to see if the files are still there.
What version of CMS are you using and how is it installed?
Some Docker Install on Windows Users have experienced a similar issue, which can sometimes be resolved by unsharing and resharing the Drive containing your Xibo setup. I would first check that the actual Layout files (xlf format) are in the Library location though. If they are, I would also suggest a manual backup of those files in case they are lost in the future.