The ability to set a default table style in a presentation is a major omission from PowerPoint. Currently when you insert a table it takes the formatting of one of the built-in table styles, which you can then change by choosing another one of the built-in styles.

Most brands require a specific format for their tables - e.g. a certain colour of header row, a certain style of borders, etc. It would be very helpful if these attributes could be baked into a template so that new tables automatically take on the correct styling.

Currently the only workaround for this is to include a sample table on a slide within the template, and ask users to copy that table and adapt for their data, or to manually make their table styling look the same – both of which of course are universally ignored because they require more work.

It is possible to set the default style of text boxes, shapes and lines, so default table styles is a completely logical addition.