can not do simple operation such as mirror, adjust spline toggle, etc.

[Anonymous]

Hi,

Why I sometimes can not do simple operation such as mirror, adjust spline toggle, etc. ?  On mirror, I can not select objects and mirror line. Is there any additional setting for that operations. etc.

[davebYYPCU]

There are various Mirror commands, depends on which area of work you are in.

Mirror line is for sketches being edited, 

Other Mirror commands can be found in solid modelling with Planes used for the function, and the Symmetry command in the Forms area, uses faces.

Might help...

[jeff_strater]

please show a screencast of what you are attempting.  It is impossible to tell what issues you are seeing from your description alone.

[Anonymous]

After posting my issues on this forum, I watched Lars Christensen video and other video also about preference setting. I followed his talking and tick here tick there on my preference. After all, I found no more issues. But I do not know exactly which one cure the issues. Now, my fusion 360 works OK. Everything OK. Thanks for the replies.