Creating Borders around Circuit Blocks

How can I create the following the link below? I would like to be able to make dashed borders in the snippet below. Link to github.

They are just graphic polylines, drawn with the tool whose icon is a dashed square and just above the big T on the RH toolbar. You can choose the line style, I think it defaults to dashed. The graphics text tool (T) will be useful for labelling the blocks.

As retiredfeline wrote, indeed, just graphics.
In the menu the polyline is in: Eeschema / Place / Graphic Polyline

However, I do find it very bad practice to do this in schematics. It looks fancy in the beginning, but it is a real strain and very time consuming to edit a schematic and then after each edit update those graphics.
It is a fallacy to believe you can first draw the whole schematic, and then when finished you add the graphical lines. It just does not work that way. You will very likely want to make a lot of small adjustments, and a lot of the times those graphics get in the way of the editing.
And even if you add them at the very end… Then the graphics would not have been useful to yourself, as the only thing left is to archive the project or put it on a website.

Just keeping some empty space between different parts of the schematic is just as clear to separate the parts.
A very simple thing you can do is to make the “header” text that says what a particular schematic block does bigger. This does add some clarity and is easy to maintain / move if needed.

The only time I find the dashed lines useful are for indicating ganged switches or highlighting sections on a board that may not always be populated.

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