Open Creative Settings › Bevel to shape the edges of the glass mesh.

Bevel Edges

Enable this control to bevel the mesh edges.

Width

Sets bevel width. Each unit is 0.2% of the longest object dimension. Increase it to make the bevel wider.

Roughness

Controls reflections on the bevel separately from the rest of the glass. Use it with the main Reflections controls to adjust the edge appearance.

Subdivisions

Sets the bevel profile. 1 creates a flat bevel; higher values round it.

Angle Limit

Restricts beveling to edges whose adjacent faces differ by more than the selected angle in degrees. Adjust it to control which edges receive a bevel.