OK none of those should case the scanning of E, I'm not sure if you fully understand what Tech mentioned. There are three buttons, Local Disks, Folder Selection and Removable Media. If you happen to click the Local Disks that will scan all partitions, if you also click the Folder selection and select the partitions you want to scan, they will also be scanned.
So you would notice at some point that it scanned the E partition, but possibly not that it has scanned the other partitions twice.
So if you want just a selection of your partitions it is important not to click the Local Drives and only the Folder Selection button. When you select the partitions, they are listed in the Selected Paths (see image). At that point ensure that point ensure that E hasn't been selected.