I can undo only one action in my model. Is there any setting for this?
In order to set the buffer size for undo function, you can open the "Program Options" dialog box. The "Program" tab includes the option "Buffer size for undo function", which is set to 4096 kB by default.
Structural engineering software for finite element analysis (FEA) of planar and spatial structural systems consisting of plates, walls, shells, members (beams), solids and contact elements
The structural engineering software for design of frame, beam and truss structures, performing linear and nonlinear calculations of internal forces, deformations, and support reactions