In-game, open the console (usually the ~ key) and type: grass.enable 0 .
Removing bush and tree textures in FiveM is a popular way to boost FPS on low-end PCs or gain a competitive edge by clearing sightlines. While you can't simply toggle a "No Foliage" button in the standard settings, you can achieve this by installing custom shader or texture files into your FiveM directory. FiveM - How To Remove All Bush & Tree Textures ...
If you want to keep the "vibe" but improve performance, some players use "Dead Vegetation" mods. These replace lush green textures with brown, "late autumn" versions that are often less resource-intensive. In-game, open the console (usually the ~ key)