Tools are disabling while switching from assembly to sketch and sketch to assembly?

Initially I uploaded parts to assembly, now I switched part to sketch for editing. After this I again switched to assembly. Now the problem is The constraint tool box and manipulation tool box get disabled whats the reason?

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Because you have to activate assembly design. If you check your blue named level in picture, you will see it.

Double click top assembly will activate assembly easly.

 
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