Liquids do not have a fixed shape but they do have a fixed volume. The particles are very close together. Most of the particles touch each other. The particles can move around.

Do liquids have a fixed volume yes or no?

In a liquid, the particles are still in close contact, so liquids have a definite volume. However, because the particles can move about each other rather freely, a liquid has no definite shape and takes a shape dictated by its container.

Why liquid has fixed volume?

Liquids, because they flow, can occupy whatever shape their container has, so they do not have a fixed shape. Because the particles in liquids are very close together (barely further apart than in solids) liquids do not easily compress, so their volume is fixed.