CODESYS Webvisu V2.3 still uses Java applets, which are no longer supported in the new browsers.
iniNet now offers an editor tool specifically for this conversion at a SPECIAL PRICE: For only 450.- Euro / year plus VAT you can convert unlimited HMI to HTML5 and again to play back on the existing PLC.
This also works as a retrofit, e.g. on older Wago PLCs such as the 750-881 (also 871 and older models). You can make old controls fit again and solve the applet problem once and for all!