side menu with build options not visible

@armia4design

There is nothing wrong there. You just have no structures to build stuff with.

The Mobile Construction Vehicle is not a unit that builds things. The only thing capable of building structures in C&C is the Construction Yard building. The MCV is a packed-up Construction Yard, and it needs to be unpacked before it is a working Construction Yard.

If you start the actual campaign missions, this is explained to you, but don't expect beginner's tooltips for skirmish or online games; they are meant for players who already grasp the basics.

Note that there is a guide for this. On the game's main menu, click the Help button, then follow the "Get started in C&C Remastered" link. It will bring you to a basic gameplay guide.

You may also want to check out the original game's manuals. Some of the key bindings may be slightly different, and the sidebar is a bit redesigned, but 98% of the manual will still apply completely the same way to the remaster, and it has a really handy overview of all the units and structures and their functions.

• C&C Wiki: Command & Conquer (1995) manual
• C&C Wiki: Command & Conquer: Red Alert manual

You have no idea what I talking about, I am talking about a technical problem in the game itself, I spent my childhood playing this game I know how to play it. The side menu has no options in all of the game and many other players having the same issue. 

@armia4design 

The screenshot you gave clearly shows that your MCV is not deployed to a construction yard yet, and in that case it's perfectly normal that you can't build stuff yet.

If I have no idea what I'm talking about, it's because you gave a screenshot that just shows a completely normal game situation. If you get an abnormal situation during gameplay, give a screenshot of the abnormal situation. Because the one you gave is not abnormal at all.

This isn't C&C: Generals. The MCV is not a "builder unit". You need to deploy that thing before you get any build options at all.