Here's what I get when I want to check my operating system build:

[IsabellaMiller]

Here's what I get when I want to check my operating system build:

Well actually it is so very tiny and almost unreadable. I can't figure out how to get the font large enough that I can read it.

[#2]

In the Run window, type winver and click OK.
The window that opens will display the Windows 10 build that is installed.

[#3]

In the Settings window, go to “System” and then select “Display” from the left-hand menu.

Under the “Scale and layout” section, you will see a dropdown menu labeled “Change the size of text, apps, and other items.”

Select a higher percentage from the dropdown menu (e.g., 125%, 150%, 175%) to increase the overall size of text and other items on your screen.

[#4]

Unfortunately Microsoft doesn't provide a mechanism to determine the cumulative update version. Since they don't really provide operating system service packs any longer, it would be useful information.

[#5]

The new Settings app also offers build, edition, and version information in a user-friendly form. Hit Windows+i to open Settings. In the Settings window, navigate to System > About. Scroll down a bit and you'll see the information you're after.

[#6]

Using the Settings App:
Press Windows + I to open Settings.
Go to System > About.
Here, you'll see information about your device, including the edition and version of Windows.

Using the Run Command:
Press Windows + R to open the Run dialog.
Type winver and press Enter.
A window will pop up showing your Windows version and build number.