Selecting a group of clips in a track

I'm running kdenlive 4.4.5. I need to select multiple clips in a track (but not all the clips in that track) to slide them all to the left or right. I can do this by ctl-clicking each clip in succession, and hoping not to botch it by clicking wrong. However, selecting 250 clips this way is time consuming and difficult, especially when, on the 187th click, I botch it and lose the whole selection! Is there a better way?

I believe it's called the "Spacer Tool" on the tool menu. It's an icon at the bottom I never tried.
Works great! What a relief!

For selecting entire project click on a clip and press: control + A. If you want to select a group you can hold Shift and drag mouse to box select those clips.