Since WP change version from 4 to 5, the LayerSlider is still visible by visitors (1) and working (2); but I cannot modify it because the page become white (3) when I try to modify the slider. I buy the new version but it is the same problem.
There is no issue like this present in the latest release of our plugin (6.1.0.), so it is likely a conflict problem on your installation. To start troubleshooting please try to temporary disable other plugins and switch to a default theme to see if that solves the issue.