When I edit the ‘text’ field and type Left Arrow Key inside the ‘text’ input, the left column is selected. The correct behavior is to move between the letters. Can you solve this in the next update?
As a workaround, you can redefine keyboard mappings for inline editors and change the behavior to what you want
Here is a related article: https://docs.dhtmlx.com/gantt/desktop__inline_editing.html#inlineeditingmodes
And a working demo: https://snippet.dhtmlx.com/eaee85c6c