By default, activation dialog is displayed after activation so that end user can manage issued license: remove, extend or transfer his license (depending on enabled options) or in case limited license feature with "Display license expiration counter" option is enabled.
If you don't want activation dialog to be displayed on each run you can let end user choose when to invoke activation dialog by using specific special key or combination of special keys (Special key pop-up enabled feature). Please note that special-key should be toggled before application is run as activation dialog is invoked during startup.
You can also use "Auto enter application after N seconds" option to force closing of activation dialog after limited period of time.
If you intend to manage license from your application by using advanced protection interface you should enable "Application will handle license management" option in protection interface settings as this option will prevent activation dialog from displaying on startup after application is activated.