Yesterday I was making a video on After Effect. In that video, I have to scale a layer from 100% to 12000% so I set a keyframe at 100% and another at 12000%. The problem is although I set the keyframes to Linear, the layer moved like in Ease In, it speed up then slow down. I absolutely sure I checked the keyframe option many times, the Keyframe interpolation is Linear. Please help me out, I can't find any advice on the internet.
Large animations of scale like this often look more natural and smooth when they are exponential, not linear. Try this: with both scale keyframes selected, right-click one of them, then choose Keyframe Assistant > Exponential Scale from the context menu.