The default product number of blocks on the store homepage or sidebars is ten. If you want to show more or less products in the block, you can change the product number yourself.

Step 1: Go to the "Design"->"Theme"->"Layout" to choose the store page.

Step 2: Click the little triangle on the right of the widget where you'll be able to change the limit number. Don't forget to click 'Save'.

Step 3: View your store front, the listed products number should be the number you chose.

Screenshot (Before)

Screenshot (After)