How can I limit the number of rows in a Numbers spreadsheet?

You might try asking in the Numbers Help Community

Numbers for Mac - Apple Community

Add or remove rows and columns in Numbers on Mac...

https://support.apple.com/guide/numbers/add-or-remove-rows-and-columns-tan504013a74/mac

Click the table.

Do any of the following:

Add or delete a row or column at the edge of the table: Click the Add Row button in the bottom-left corner of the table to add a row, or drag it to add or delete multiple rows. Click the Add Column button in the top-right corner of the table to add a column, or drag it to add or delete multiple columns. You can delete a row or column only if all of its cells are empty.

Add or delete both rows and columns at the edge of the table: Drag the Add or Remove Rows and Columns button in the bottom-right corner of the table to add or delete both rows and columns. You can delete rows and columns only if their cells are empty. To delete rows and columns that have data, Option-drag the Add or Remove Rows and Columns button.

Insert or delete a row or column within the table: Move the pointer over a row number or column letter, click the arrow, then choose an option from the shortcut menu.

The table column menu with commands for adding or deleting rows and columns.

Insert multiple rows or columns at once: Anywhere in the table, select a number of rows or columns equal to the number of rows or columns you want to insert, click the arrow next to one of the selected row numbers or column letters, then choose Add Rows Above or Add Rows Below (or Add Columns Before or Add Columns After).

Delete multiple rows or columns at once: Command-click the rows or columns, click the arrow, then choose Delete Selected Rows or Delete Selected Columns.

You're welcome. great news that I was able to help.