Select objects you want to align to baseline grid, and then on the Layout menu, select what you want.

The possible choices are:

•Align top and bottom edges of all selected objects, to the closest or to the next lover vertical grid step. The aligning of bottom edges may require change of height of some or all objects.
On the Layout menu, select Align Selection to the Vertical Nudge.

•Align top and bottom edges of all selected objects, to the closest or to the next lover baseline grid (if page baseline grid is based on module height). The aligning of bottom edges may require change of height of some or all objects.
On the Layout menu, select Align Selection to the Closest Module.

•Align left edge of the selected object (one or leftmost) with the closest column guide.
On the Layout menu, select Align Selection to the Closest Column.

•Both above actions combined.
On the Layout menu, select Align Selection to Grid.