Thank you both for replies. I solved my problem, but I’m still curious how could I modify the height in that box Detail size. I found an old report, which has the height active and you CAN modify it, but it has the Format with multiple columns checked but inactive???!!! In my report and in any another new report that I was trying, the height is inactive and I am curious why. In addition, I found in help:
Layout tab (Section Expert)
The Layout tab appears when you have the details section selected and the Format with Multiple Columns box is checked on the Common tab.
Use the Layout tab to set up your report in a multi-column format. That is, instead of having the data print straight down the page, you can set up multiple columns and have the data flow from column to column. You can also have your data print across then down the page, printing one record in each column, then printing a second record in each column, then a third, and so on. The dialog box is divided into four smaller boxes.
Detail size
This box enables you to specify the dimensions (height and width) of one detail. Determine how wide you want each detail to be (based on number of characters, font size, and so on) and enter that value in the Width edit box.
Determine how high you want each detail to be (based on number of lines in the detail, font size, and so on) and enter that value in the Height edit box.
Gap between details
This box enables you to specify the empty area (gap, gutter, and so on) you want to allow between details. Horizontal = the gaps between details going across the page, Vertical = the gaps between details going down the page.
Determine the gaps you want to allow. Enter the horizontal gap in the Horizontal edit box and enter the vertical gap in the Vertical edit box.