I understand that you want to set the initial displacement of the "Mass" block in a Mass-Spring-Damper model in Simscape. I assume that you want to change this initial value without double-clicking blocks in the model.
The initial displacement of the "Mass" block is determined by the initial deformation value in the "Spring" Block. For more details of how to initialize variables of a Mass-Spring-Damper system, refer to the following link:
If you want to change this initial value, you can use a variable (for example 'x') in the field of 'Beginning Value' of the 'Deformation' variable. You can define this variable in the base workspace. Every time you change the value of 'x' and click the 'Run' button, the changed initial displacement will be applied to the simulation of the Mass-Spring-Damper system.
