Yes we have many options to check the rules that are not checked in. On the header bar we have a option called private. click on that then it will show the check out records. The other option is in the rulesets.Go to the rule sets, their you will find the count of rules that are not checked in in that ruleset version.If you click on the count means it will open in a new window showing all the rules which are not checked in.
1) In the header bar of the designer studio, there is a "Correct Symbol" beside the search bar. If you click on that it will give list of cheked out records.
2) Second way is just open ruleset and there you will find "Rules currently Checked Out" column, This column gives the number of checked out records. If you click on that number it will give the details of the checked out records.
3) And last way is click on Private Explorer (Left side of designer studio namely explorer area), it gives the list of checked out records.