TYPO3 Core

With TYPO3 v11 the Frontend-Login was changed to Extbase/Fluid instead of marker-based templates (Yeah! :D)

Felogin has a constant to globally set the storagePid:
styles.content.loginform.pid

This constant get's set as TypoScript pages setting:
plugin.tx_felogin_login.settings.pages = {$styles.content.loginform.pid}

But that value is always overwritten with an empty Flexform value.

This happens in extbase FrontendConfigurationManager:
FrontendConfigurationManager.php#L193
FrontendConfigurationManager.php#L213

This means you now always have to configure the Storage PID within the element and it's not possible to globally set the PID for all elements.