In this article, you will learn how to quickly select (highlight) all elements or text in a specific window or folder in order to perform an action with all elements / text at once.
Steps
Method 1 of 2: Using a keyboard shortcut

Step 1. Find the items you want to select
They can be in a document, on a web page, or in a folder on your Mac.

Step 2. Click on any point inside the window
This refers to a window with text, images or files that you want to select.

Step 3. Press ⌘ + A
The ⌘ keys are located on either side of the space bar. All items in the active window will be highlighted. They can now be moved, deleted, copied or cut.
You can also open the Edit or View menu from the menu bar at the top of the screen, and then click Select All
Method 2 of 2: Using your mouse or trackpad

Step 1. Select all files displayed as icons
Open the folder with the files you want and expand it to full screen to display all the files.
- Position the pointer in the upper left corner of the window. Move the pointer over an empty space in the folder, not a single file.
- Hold down the left mouse button and drag the pointer to the lower right corner. All files and folders in the open folder will be selected.

Step 2. Select all files displayed in the list
Open a window or folder with items displayed as a list.
- click on the first file or item in the list;
- press and hold the "Shift" key;
- click on the last item in the list;
- all list items / files will be highlighted.
- Now items / files can be moved, deleted, copied or cut.