I wanted to know if it is possible to freeze certain column in the Gantt Chart so I can always see it (just like in Excel --> Window --> freeze PANES).
You're in luck, this is possible. As a matter of fact, the first column is always locked by default, and it is the ID column.
So try this: Click on >View, >Table, >More Tables, Select Entry and click on Edit. You will notice there is a checkbox which is enabled that says "Lock first column". You will also notice the first column is ID. If you would like another column to be the column that is "locked", simply Insert Row, click on the dropdown and add your column.