While building new Cosmos applications, “Use react-based landing pages” got auto-selected for application due to which end-user portals/App studio design mode is not working. The issue is replicable for new case creation or even while clicking any link/button on the portal(like Dashboard, Operator profile, Reports, existing case id). Also, we are not able to trace any event on the portal, while debugging further we found attached DOM-related exceptions from OOTB JS.  

We applied the below configuration but still it didn't work.

-DNodeSettings='PEGA-UIENGINE/CONSTELLATIONSVCURL=https://prod.constellation.pega.io/c11n-appstatic;PEGA-UIENGINE/CONSTELLATIONPEGASTATICURL=https://prod-cdn.constellation.pega.io' DSS - ConstellationPegaStaticURL- https://release.constellation.pega.io and ConstellationSvcURL - .../c11n-appstatic Questions: 1) Can we revert the configuration of "Use react-based landing pages"? 2) What other configuration do we need to make so that we can make the hybrid application work?

Observation in Pega 8.7 environment(other internal servers): - We deployed our application to another internal server and found that after deployment it started impacting all applications. - With further analysis, we found that after removing our application from the operator application stack issue got resolved for other applications. - So, we could observe the only difference in configuration for our application as “Server rendered UI” and “User react-based landing pages”(additionally) selected.