Trait selection problem on Autocad

Hello everyone, I'm having a problem with line selection on Autocad, normally I can select several lines  one after the other in order to have a group of lines selected to make a group or move the elements for example. Since yesterday, each stroke selection deletes the selection of the previous one, a bit like on Solidworks. Can you tell me what this is due to and how to go back to a normal selection? 
Thank you in advance. Kind regards.

Look at this option


autocad_options.jpg
1 Like

Hi Stefbeno, it's indeed this option, following my research, I would even add that the option can be changed by typing "PICKADD" in the command and setting to "2".

Thank you.