This is the basic WordPress block editor. This is a basic text block. To add a block / element click on the blue/white + box in the top left of the screen.
You can edit the blocks independently and move them into any order you like by clicking on them and using the up / down arrows in the pop up toolbar.
If you want to have more options press ‘Edit with Elementor’ this will convert the page into and Elementor page but once it is an Elementor page you won’t be able to easily use the WordPress editor again.
Pressing on the W in the top left will take you back to the dashboard.