You can hide and unhide the IDPs by performing the following steps:
Check the Decommission/Show/Hide checkboxes corresponding to the IDPs you want to hide.
The selected IDPs can no longer be viewed on the IDP Management screen.
If you want to unhide the hidden IDPs, go to Welcome <username> > User Preferences.
Check the Show Hidden Items checkbox to unhide the hidden items.
The hidden IDPs will be displayed back on the IDP Management screen in disabled form.
Select those disabled IDPs and click Show. This allows you to restore the hidden IDPs.