Step 1: Click on the target partition

Directly click on the partition you'd like to extend (C: Drive for example) and Click NEXT to open the extend window

Step 2: Extend this volume

Three methods can be used for extending the volume: drag the handle rightwards, click on the right-arrow button, and directly input size

Step 3: Click OK to commit

Click OK after the preview effect suits you and click OK to local the volume and then click OK again to perform the extend operation

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(Click on the screenshot to enlarge)