Invisible symbols: hiding and revealing

Answer:

You can hide a task row, but not symbols.  

However, you can use an "invisible symbol" (null symbol):

1. Double-click on a symbol in the ToolBox

2. Choose symbol shape number 28

Now, to change a symbol on the schedule to this null symbol:

1. Click the Arrow tool  

2. Click the symbol on the schedule that you want to "disappear"

3. Click the null symbol in the Toolbox

Many people use the null symbol to attach symbol text while not showing a symbol.  

Related topics

Help finding "invisible" symbols   

Why are my symbols hollow?

Custom symbol colors