This thread is resolved. Here is a description of the problem and solution.
Problem: When selecting the secondary language, the page is not loading. I did not make any changes to WPML settings. It worked very well. Now it doesn't work.
Solution: Just make sure that all the options from Dashboard → LiteSpeed Cache → Settings →  Optimize area are set to Off. Once you purge the cache, things will be back to normal. Usually, this issue is caused by styles and scripts that are minified and are no longer working as expected.
This is the technical support forum for WPML - the multilingual WordPress plugin.