Draw shapes with the Ellipse tool

Select the Ellipse tool () from the toolbar. If you can't find the Ellipse tool, click and hold the Rectangle tool to show the other related tools, and then select the Ellipse tool.

In the shape tool options bar,  set Mode, Fill, Stroke, W, H, Path operation, Path alignment, Path arrangement, Additional shape and path options, and Align Edges.

Position the pointer on the canvas, then click and drag to draw an ellipse. Hold the Shift key as you drag if you want to make a circle. 

To begin the shape from the center, click and then press  the Alt (Win) / Option (Mac) key while dragging the mouse to create the shape. Release the mouse button first, and then the key. As an alternative, you can click on the canvas and enter ellipse details there.

With the shape layer selected, you can use the move tool () to reposition your shape on the canvas.

To scale, transform, or rotate your shape, choose Edit > Free Transform or Control+T (Win) / Command+T (Mac).