Disable Background On Desktop Excel Using Office Js Displaydialogasync Function

We are using add-in manifest file to run application on taskpane on Desktop office 365. We have use office js DisplayDialogAsync function to open dialog box i.e. Office.context.ui.

Solution 1:

The dialog that is created by the displayDialogAsync method is non-modal. Perhaps as a workaround, you could set the height and width to 100. This should cause the dialog to fill most of the screen, although it won't prevent users from moving dialog and clicking on other things. But having a modal option to the dialog is a good idea. Please request it at Office Developer Suggestion Box.