Does the wizard show you stats as you go?

Have you tried using T-SQL to restore?  The wizard is probably that way because it's probably just busy in the background, which is certainly the case if your bak file is big (or trn files are plentiful).  The script below will show you stats every 5% in the "Messages" tab.

Might also help to take the database offline prior to a restore (ensure there are no users while doing this, or it will "do it for you"):

    --Taking DB Offline due to errors received without this.
    --Error: "Exclusive access could not be obtained because the database is in use."

    ALTER DATABASE [DBToRestore]
    SET OFFLINE WITH ROLLBACK IMMEDIATE
    GO
    ALTER DATABASE [DBToRestore]
    SET ONLINE
    GO

    RESTORE DATABASE [DBToRestore] FROM  DISK = N'Directory\SourceDBbackup.bak' --**Replace this value with the most recent FULL Backup file (BAK)
    WITH  
	FILE = 1
	,  NORECOVERY  --If Transaction Logs are available, use this
	,  NOUNLOAD   --Tape remains loaded on the tape drive.
	,  REPLACE    --Replace the destination database.
	,  STATS = 5  --Displays stats update message for every ## Percent complete.

    GO


https://learn.microsoft.com/en-us/sql/t-sql/statements/restore-statements-transact-sql