To open Safari always in full-screen mode, open System Preferences General, and untick 'Close windows when quitting an application'. Then, close Safari always in full-screen mode, so Safari will always start in full-screen.
The screen on my MAC laptop will not display a full screen. I uninstalled an Eff (I think) program and an Applications program that got installed accidently. After I did that my screen only displays the top 1/3.
To take a screenshot, press and hold these three keys together: Shift, Command, and 3.
If you see a thumbnail in the corner of your screen, click it to edit the screenshot. Or wait for the screenshot to save to your desktop.
Going full screen helps you stay productive and avoid distractions. On the Mac, you can split up your screen and have two programs running at half-full side-by-side. This is useful for when you want to work in one app but reference another. You can really make full-screen mode work to your advantage if you know how to use it.
How to capture a portion of the screen
Press and hold these three keys together: Shift, Command, and 4.
Drag the crosshair to select the area of the screen to capture. To move the selection, press and hold Space bar while dragging. To cancel taking the screenshot, press the Esc (Escape) key.
To take the screenshot, release your mouse or trackpad button.
If you see a thumbnail in the corner of your screen, click it to edit the screenshot. Or wait for the screenshot to save to your desktop.
How to capture a window or menu
Open the window or menu that you want to capture.
Press and hold these keys together: Shift, Command, 4, and Space bar. The pointer changes to a camera icon . To cancel taking the screenshot, press the Esc (Escape) key.
Click the window or menu to capture it. To exclude the window's shadow from the screenshot, press and hold the Option key while you click.
If you see a thumbnail in the corner of your screen, click it to edit the screenshot. Or wait for the screenshot to save to your desktop.
https://mannew531.weebly.com/blog/clock-timer-app-mac. In macOS Mojave or later, you can change the default location of saved screenshots from the Options menu in the Screenshot app. You can also drag the thumbnail to a folder or document.
Learn more
Full Screen On Macbook
In macOS Mojave or later, you can also set a timer and choose where screenshots are saved with the Screenshot app. To open the app, press and hold these three keys together: Shift, Command, and 5. Learn more about the Screenshot app.
Some apps, such as the Apple TV app, might not let you take screenshots of their windows.
To copy a screenshot to the Clipboard, press and hold the Control key while you take the screenshot. You can then paste the screenshot somewhere else. Or use Universal Clipboard to paste it on another Apple device.