Second UI page is getting opened inside the first UI page

[BhawnaShakya]

Hi Team,

Currently we're using UI action workspace client script to call a UI page and inside this UI page client script we're calling second UI Page through GlideModal. 

Expected Behavior - There are Two buttons in the UI page, in the first Ui page whenever we click on send button, the first UI page should be closed and second ui page should get opened. It is working fine in the Native view but not in workspace.

Existing Behavior - First ui page is not getting closed when we click on send button and second ui page is getting opened inside the first ui page. When we close second UI page then first UI page still remains open.

Many Thanks in advance.