If you would like to freeze some colums within a OpenGround Cloud Grid. Open the grid you wish to freeze, I'll use the Locations Details grid for this example.
On the extreme left of the grid you will see a grey shadow line running vertically down the grid, this is between the grid and Summery field, see screen shot
Click on the grey vertical line and drag this across the grid to where you want to freeze the columns
If you need to reverse this or change where the grid is frozen, just click on the grey vertical line and amend