It isn't possible that I know of to take one item off a stack in your inventory. Right clicking a stack in your inventory will split the stack in two. If you press SHIFT and right click on a stack on the bookshelf it is possible to get one item.
If you press ESC, under options, clicking the controller tab at the top will give you the options for the different controls.

Crates are decorative. You can store a stack or one item of something on top. The only crates that you can open are the animal crates.

Make sure you complete the 8-9 part tutorial. It will walk you through a lot of the mechanics in the game. After the first day you will get the next part in the mail on the next day. Once you complete the task in the mail then the next day you will get another task for the tutorial. If you do a part each day it is possible to get done with it in 8 days. I say 8-9 parts because in the original Staxel the tutorial is 8 days. In Staxel CE it is 9 parts

Thank you. I don't know where the tutorial ends and the quest begins lol. I just keep talking to people around town and checking my mailbox, last thing in my mailbox was the crickets for Rowan.

Part one is Meet Farm Fan and plant seeds
Part 2 is the meet and greet
Part 3 is Building the Barn
Part 4 is getting the pet
Part 5 is Cricket Invasion
Part 6 is building the fishing spot (Riah)
Part 7 is Cooking (Rowan)
Part 8 is getting the license (the Mayor) - Make sure to talk to Farm Fan after you talk to Max
They all come through the mail
If you're playing Staxel CE then part 9 is the Postage and Handling quest from Leif. Otherwise you will get that one after the tutorial is done and Leif is high enough friendship level

Using a mouse, left click stack of items in your inventory, hold over an empty spot in the active row, right click and it will place one item from the stack. Right click as many times as you like to get the number you want. You can then place on the saw.