Font size of albums

Hello Tammy1999,

I assume you want to change the album title under media > album tab.

To change the font size of album name, you will need to set font size for .rtmedia-container .rtmedia-list .rtmedia-item-title h4 selector.

Goto wp-admin > rtMedia > Custom CSS and put the style as given below,

.rtmedia-container .rtmedia-list .rtmedia-item-title h4 {
    font-size: 15px;
}

Increase or decrease font size 15px as per needed in above code.

Let us know if this works for you.

If you are looking something else, please provide your website URL and the exact location where you want to change font size along with screenshot so that it will be more helpful.

Regards,