How do I scale, crop, rotate, lock and multiselect elements in the design? (sound on on the video

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Scale

You can make any object on the artboard larger or smaller. To change the size of the object, simply drag the round corner points.

Crop

You can remove some areas of a photo by cropping it.  
To crop an image, click on the image twice or select the Crop option in the objects menu.

Angle controls in the corners show what area is going to be cropped. This is a quick way to crop a photo. Drag the angle controls to make the area larger or smaller and finalize the crop by double-clicking or do so in the objects menu. Also, you can quickly adjust the cropping area by dragging the square controls.

Rotate

Click on the object on the artboard to select it and drag your mouse cursor to any of the corner points. Your cursor is going to change to a curved arrow. To rotate, click and drag a design element.

Lock

If you press the Lock button, you cannot move the objects on your artboard. It does not influence filters, the copy function, transparency, and selection of photos.

Multiselect

To select several objects on the artboard at once, click and drag with your mouse over the objects you want to select.