A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
I'm running Office 365 with 2 external monitors and ran into the same issue.
I tried different combinations of adjusting text size between the 2 monitors and only the 125% setting on both monitors eliminated the problem of truncation (on cells and charts).
While this is a good fix, it's very frustrating given I'd prefer the 100% setting and I've lost a lot of available real estate to do productive work since everything is larger.
If anyone has a permanent fix, I'd love to hear it!