In Blender 2.79, mesh vertices were highlighted in the “tweak” selection mode by holding down the “shift” key and a slight cursor movement with the right mouse button pressed. This allows quickly add vertexes to the selection without aiming each vertex with sniper accuracy.
In Blender 2.8x, this method has become unavailable due to the left click selection change. For those users who remained on “the right click select”, nothing has changed, everything works as before. The “tweak” selection was broken only for those who switched to the left click selection.
To use the “tweak” selection with the left click select, you need to make the following changes into the keyboard shortcut settings:
Open the “Preferences” window, click the “Keymap” button and in the “3D View – 3D View (Global)” branch change the “view3d.select” operator settings for common pressing and for pressing with the “shift” button, as follows:
To fix clicks with the “ctrl” – type the “short” int the search field and find the operator “mesh.shortest_path_pick” in the “Mesh” branch and configure it as follows:
Be careful – the local “tweaks” settings don’t need to be edited! Their settings are easily confused with global ones. Check that the local “tweaks” settings have remained unchanged, as shown:
The solution authors: Mikhail Soluyanov and Pavel Kotelevets.