Had the same problem. Yep, Alex-934 suggestion worked for me. Little addition: you have to close Tekla before you make edit in RegEdit. 'X' and 'Y' values are in DWORD, so I suggest you to change these values to 'decimal' when you edit them.
To return the panel to its place, use regedit. Way:
HKEY_CURREN_USER > SOFTWARE > Trimble > TeklaStructures > 2020 (or any other version)> Toolbars > xs_library_connection_toolbar
If the value in the VISIBLE string is '0', then change it to '1', and if the value of x or y is too large (such as 3065), then change it to any number within 150, for example, x=40, y=140. After that, run the component editor and the panel will return.
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