Problem during the construction of T1-T3 engineers

[Kafel]

When choosing T1 and T2 engineers (T1-T3), you can only build T1 buildings, but I want to build T2(t3) buildings. How to fix it?

[A Former User]

Well, they added a hotkey for this, find it and assign a key, or just kill all your lower-tier engies, or send them to assist a factory or reclaim far away and forget them

[Kafel]

Thank you