The physical appearance of your proposal is often used by the reviewers to judge your scientific ability. A sloppy proposal may be taken to indicate that your science may also be sloppy. Spend the time to make a good summary of the proposal. Particularly in a panel review process, the summary may be all that some reviewers will have time to read. Do not use a small font to squeeze more words on a page.
Reviewers hate that because it make the proposal hard to read.
Instead, cut back on the words. Keep the proposal short - A shorter proposal will have a bigger impact on the reviewers. If auxiliary information is absolutely vital to show that you have the specialized skill or knowledge to do the proposed research, add it in an appendix. Scope of project Do not try to do too much. Think about what you plan to do and keep it within bounds.