Please follow the steps below to insert a shape into a worksheet:
Step 1: Click anywhere in the worksheet;
Step 2: Click the "Insert" Tab from the ribbon;
Step 3: Click "Shapes" in the Illustrations section;
In Excel 2019, you need to click "Illustrations" first, then "Shapes".
Step 4: Select a shape from the shape list;
Step 5: Click the location where you want to insert the shape.
You can adjust the shape size by clicking and dragging the resize handle.