There is too little space in the table of contents with two-column arrangement.
Right-click the "Contents" to open a dialog box where you can unselect the "Content in two columns" option. Thus, the table of contents is displayed in one column only.
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