How to Adjust Render Distance in Minecraft Java Edition
A hilltop is a better place to tune render distance than a small room. Choose a spot overlooking trees, water or buildings so you can see both the cost and the benefit of drawing more terrain.
Set up a repeatable view
Open a single-player world, stand still and note the direction you face. In Options, open Video Settings and record your starting render distance. Leave simulation distance alone during this comparison. Render distance controls how far you can see terrain, while simulation distance governs how far away the game actively processes things such as mobs.
Compare three distances
Try a short distance, a middle value and your original setting. Allow the view to settle after each change. Pick a distant landmark and note when it becomes visible. Walk the same short path at each setting and watch for uneven movement as new scenery appears.
Choose for the way you play
A builder looking across a valley may prefer the longer view. For exploring on an older laptop, choose the shortest distance that still lets you navigate comfortably. On multiplayer servers the server can limit the terrain it sends, so repeat the comparison in single player if raising the slider appears to do nothing.