You have two options to force Autostart in GUI version of WWebserver:
1. Set argument --autostart in Shortcut of WWebserver like:
"C:\WWebserver with PHP 7.4.10\wwebserver.exe" --autostart
This will also close the GUI window and show only the taskbar icon.
2. Open cfg/init.txt and set parameter forceGUIAutostart=true
This will start the webserver automatically and open the GUI window.
forceGUIAutostart is only available for PHP 5.4.45, PHP 7.4.10 and higher versions.