UI Pages Option not available in App Studio

I have an application based on theme-cosmos,I can see the Preview button in App studio just next to application name.

When clicking on preview,I can’t see the design toggle icon.It was guided that after clicking on design toggle icon, UI Pages option should be visible on left side panel, but I am not able to see any of this.

@RumelaB4

Empty the DSS related to constellation , recreate a new application rule making sure react based landing pages check box is un-checked. then UI pages will load.

@SriharshaAnika ,I have the server rendered UI option enabled in my application of Personal Edition 8.7.From App studio, I am following the below steps:

1.Click on Preview.

2.Click on Design.

3.There is one dropdown “Pages” From where I can select an existing page to add into main/operator menu.

After following this, I can’t see where the UI page is actually added.Also there will be a category “pages” on the left panel where all settings,overview options available.I can’t see that one as well.

@RumelaBasu Can you please help? I am facing same issue with 8.8. Unable to see Pages option if application build on Theme Cosmos.

@RumelaBasu

In application setting set UI runtime as pega traditional Ui

@SriharshaAnika

I am facing similar issue. Could you please provide name of the DSS ?

@ACCENRAJSEKHAR @RumelaBasu @SamaptiP9074 please see the answer given in

Unable to find Pages (UIPages) option in left pane of the App Studio 8.8

@SriHarsha Anika can you please provide a definitive response?

Ensure application settings resemble the below image