I don't think that is possible. You can lots of other things between the sections and move the section around, but I don't think you can move the columns for just the Client Funds section.

Some things to try: "pump up" the font for the A/R Balance Due -- making it bigger and bolder than regular text to pull it out. Page break before the Client Funds recap. Add a custom message or title section before the Client Funds section to make it clear that what follows is separate from the A/R balance. Put extra lines before/after Client Funds to separate it. Etc., etc.

How do I gain access to the Client funds section? it seems to be hidden from view in the Time charges - Summarized Section.

That was sort of my point, you can't "see" that section in the layout, so you can't adjust any spacing within it.

Okay, let me rephrase, in which section are the Client Funds fields located ? I have been putting lines before and after every section to test it, but still can't find where to place the line?

Client funds are part of the miscellaneous section

If you have a bill layout open, click on the Section menu, then Configure Layout Sections, find the section named: Client Funds transactions and balances and adjust the options for that section.