Hi Sheida,
You can activate or deactivate the new UX[15.2] from General Settings ->System Options in the New User Experience.
Once the New User Experience check box is enabled you can login using the below URL to see the new UX.
http(s)://<servername>/pm
If you want to come back to classic PPM screen you need to have the access "Classic PPM - Navigate" granted to the user account.
You can Click the Classic PPM link to come back to classic CA PPM.
You can create a Menu Link to New User Experience to access within the Classic CA PPM,
1. Go to the project object
2. Go to the Actions tab and Create a new action like the below,
Make sure to select the type as External Link and Enter the URL
http(s)://<servername>/pm
3. Once the Action is created go to Administration->Studio->Menu Manager and select Application Menu and click Add button and select Action Link and click next.
4. Give the Link Name and select the Action Name which is created to Link New UX and select the Parent Menu Item as Personal and click Save and Return.
5.Now the New UX Link is available within Classic PPM.
Currently the New UX supports Projects, Resources and Timesheets.
If you activate the New UX Timesheet option then the current Timesheet Menu link and Timesheet Icon will be removed from Classic CA PPM.
To access the UX Timesheet you can use the below URL,
https://<servername>/pm/#/timesheets/staff
New UX Project Screen:
URL: http(s)://<servername>/pm
New UX Resources Screen:
URL: http(s)://<servername>/pm/#/resourcemanagement
New UX Timesheet Screen:
URL: http(s)://<servername>/pm/#/timesheets/staff
New UX Classic PPM Link you will see only if the "Classic PPM - Navigate" access granted.
Regards,
Arun