Eurogamer - Command & Conquer: Remastered has a button to switch b/t graphics modes on-the-fly:
https://www.eurogamer.net/articles/2019-10-24-first-command-and-conquer-remastered-gameplay-shows-how-you-can-switch-between-classic-and-modern-graphicsNotes:
- C&C: Remastered will include C&C (original) & C&C: Red Alert with all of its expansions packs.
- C&C: Red Alert with all its expansion packs includes Covert Ops, Counterstrike, and Aftermath.
- Source code was found & used to work on this Remaster.
- They are using a 2D style, to stay in line w/ the original game.
- From keeping the 2D style, this made it easier to allow for players to switch on-the-fly b/t the assets.
- The new assets were re-concepted, re-models, re-constructed, and re-animated from scratch.
- Assets range from 320x200 up to 3840x2160 assets (a.k.a. 2160p or 4K).
- Tap a single key while playing to switch b/t the assets & modes.
- You can also zoom in and out.
Video on Youtube of the gameplay w/ the graphics mode switch: