Fixed height

You can set Jodit height in pixels or percents. It automatically will add resize handle.

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Include Jodit

<link rel="stylesheet" href="build/jodit.min.css">
<script src="build/jodit.min.js"></script>

Create input element

<textarea id="editor"></textarea>

Create Jodit instance

var editor = new Jodit('#editor', {
    height: 200
});
editor.setEditorValue('<p>test</p>'.repeat(50));

Result

If you want disable horizintal or vertical resizing use allowResizeX or allowResizeY options

Remove the size change trigger

var editor = new Jodit('#editor', {
    height: 200,
    allowResizeX: false,
    allowResizeY: false
});
editor.setEditorValue('<p>test</p>'.repeat(50));

Result