I need a boolean field to be right next to another (not above or below), for this I have used Grid Control, but the fields are too separated, apparently because in the Cloud version the column sizes cannot be modified. Is there any other alternative?

Yes, there are alternative options to have two fields next to each other in a form without using the Grid Control in the Cloud version. Here are some suggestions:
- Use a Multi-column form: This form layout allows you to have multiple fields in a row, allowing you to position the boolean field next to the other field. To enable multi-column forms, click on the “Form” tab in the form designer and select “Multi-column layout” in the “Layout” dropdown.
- Use a Section: Create a section with two columns and place the fields in each column. To add a section, click on the “Form” tab and select “Section” in the “Add control” dropdown.
- Use a Table Control: Create a table with two columns and place the fields in each cell. To add a table control, click on the “Form” tab and select “Table” in the “Add control” dropdown.
- Use a Gallery: Create a gallery with two columns and place the fields in each item. To add a gallery, click on the “Insert” tab and select “Gallery” in the “Controls” dropdown.
These options should allow you to position the boolean field next to the other field without using the Grid Control.