The top toolbar usually includes several formatting options as well as the option to change or transform the block type. ( in the screenshot below)
In the editor’s sidebar you can switch between settings for the current block ( in the screenshot below) and settings for the whole document. ( in the screenshot below)
The Document setting panel is where you can add tags and categories, choose a featured image, see and change the status of your post, and more — these are options that apply to the page or post as a whole.
Also, clicking on the cog icon at the top right of the editor to toggle the visibility of the settings panel. ( in the screenshot above)