Hi Andrejs,
Greetings from Syncfusion support.
By default Grid supports Normal, Dialog, Batch Edit Modes.
Normal and Dialog Edit modes will create edit forms for all records with respective Inline and PopUp, while Batch Edit mode allows to edit the particular cell in the Inline. Please refer the below documentation for more information.
Each Edit mode have options to customize the Editor component using CellEdit Template(Particular cell) and Edit Template(Entire Edit form). Please refer the below documentation for more information.
We do not have support for editing Single cell in the PopUp mode.
Please let us know, if you need further assistance.
Regards,
Manivel