The only way I can overcome the problems that SW causes is to pick each line and try and delete all of the relations that SW is creating automatically.
I don't want the relations created, but don't know how to turn that feature off.
The automatic relation creation really causes me a lot of problems.
It is suppose to help, but it almost stops me from sketching.
I'm not at my SW PC right now but to answer your question you simply toggle the relations view on or off from a command in the main display. If you normally like them off (as I do), just update that in your settings & the sketch will look cleaner. If you ever want to temporarily check a relation, toggle it back on. Its analogous to turning on solid shaded view vs wireframe view. Sometimes you need to see the model a certain way in certain circumstances, but you are free to display any way you like.
You may think that SW is constraining (pun) you but its actually helping you. You can start out drawing orthogonally & you are getting live feedback in many forms. If you are pretty accurate with the mouse, it assumes you probably want to be orthogonal. Then as you develop the sketch it provides you temporary faint yellow, dashed 'helper' guidelines showing likely logical choices you might be contemplating on the next step; perpendicular to, parallel to, aligned to... You can simply choose to ignore them & carry on or utilize them on the fly which speeds up the sketching process, up to you.
Re the relations view (little green symbols on all the corners & intersections). This is too busy for my liking too but the fact that its there to utilize is providing you important information. You may think something is centered or tangent but you have no way of knowing for sure unless you see the relations. Its kind of a visual shorthand.
In reality, the exact same thing is going on in Autocad but behind the scenes. In fact hidden well enough that its practically useless. If a line happens to be at 89.895 deg because you inadvertently drew it that way, not orthogonal 90-deg the way you intended, how would you ever know? I suppose you could dimension the angle against a reference line or confirm in th eproperties box (from distant memory), but are you going to go through that effort with the entire sketching exercise, thousands of lines & arcs? It adds a lot of overhead that the SW engineers solved for you decades ago. Its like driving without a map or GPS. You may eventually get to your destination, but there is surely a better way with passive guidance upon request. Thats what the relations are about.
btw SW does not constrain you in any manner. If you really want to zing a line off at an angle, go ahead. The whole idea of sketch is literally 'sketch'. Get the profile looking visually about right almost in a freehand manner (step-1). All the lines are blue. Then go back & define the dimensions (step-2), now all the lines become black = confirmed fully defined. The relations aspect is kind of of an in-between thing, this line perpendicular to that line, this hole centered at that point, this fillet occurs between these 2 lines... But its an important thing as I showed in my example. You can have all the dimensions locked down, but if any number of relations are not correct, well simply, the part is therefore not correct. In reality that means the drawing dimensions will faithfully reflect this error you created & the part will not be machined correctly nor potentially fit correctly. Where is the fun in that?