You can select a single block, group of blocks, or all blocks. When you select a compound block, all encapsulated blocks are implicitly selected.
To select a single block
1. Point to the block.
2. Press SHIFT+click or CTRL+click.
To select all blocks
•Choose Edit > Select All (CTRL+A).
To perform an area select
A quick way to select one or more blocks is to use area select, which lets you draw a bounding box around the blocks you want to select. If any part of a block is contained in the bounding box, it is automatically selected.
1. Point to one corner of the area you want to select.
2. Press and drag the pointer until the shimmering box encloses all the blocks you want selected.
3. Release the button.
To toggle block selection
This action automatically selects all unselected blocks at the current level, and unselects all selected blocks at the current level.
1. Point to empty screen space.
2. Press SHIFT+click.
To unselect blocks
1. Point to the selected block.
2. Press SHIFT+click or CTRL+click.
When blocks are unselected, they are returned to a normal video display.