When looking through your Moment Feed, you can activate the Filter to automatically filter out Moments you don't want to see. If your classroom has Rating Periods configured, you can filter your Moments based on when they were uploaded. 

The filter can be found in the top right, next to the Draft Moment icon

When the Filter menu loads, you can choose from a variety of sorting options, including Rating Period

Select your Rating Period and press the Check in the top right corner to apply the change. Your updated Rating Period will now display in the top left of your Moment Feed, with an option to Clear your filter in the top right