From the Moodle Dashboard page. Click "Edit mode".

To add new blocks: Click this icon located at the top-right.

Add new blocks by pressing this dropdown.

Add...
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To move existing blocks: Click and drag this icon located at the top-right of every block and move to the desired location.

To delete existing blocks: Click the cogwheel located at the top-right of every block.

Click "Edit mode" to disable editing options.

Edit Moodle Dashboard Blocks