If it is not already pinned to your toolbar, you can search it up, or ask Cortana to open File Explorer for you. On default, Windows 10 will open to Quick Access.;
,, You should see the option Change folder and search options. Choose it.
 Click on Quick Access to open the drop down list. There, choose This PC.

Open File Explorer.
Click View in the ribbon at the top.

,
Go to the right and click Options, which is right under the help sign.
At the top, right under the General tab, it should say Open File Explorer to:.
Save your settings.
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