Hi all!
Usually I use another software, but I need krita om my old slow laptop.
My questions is: how can I select for example a circle after I draw it and then change the colour or size?
Greetings from the Netherlands
Wonnie
Hello @Wonnie and welcome to the forum!
There are several ways to change select and change the color, you could select your object with the Similar Color Selection Tool, that is found in Krita’s so-called Toolbox. After you selected the object, you can fill it using the Paint Bucket, or you paint over the object with the brush you like.
Alternatively, you can activate the Alpha Lock in the Layers Docker for the layer you painted your object on, then you can do the same as before via selecting your object, so fill it, paint over it.
Parts of Krita’s UI:
Layer Switches:
But we are by far not at the end of the ladder, you can alternatively choose to do it using a Filter, which will be impractical if you already have a lot of objects on the layer where you want to change only one object, because that filter will affect all objects on the selected layer.
The same is true for so-called Layer Styles, if you do a right click on the layer your object is on, you get a context menu, which, among other options, offers the option Layer Style where you could choose the option “Color Overlay”, and then, depending on the Blend Mode you choose, it will change its color appearance. You can also use Layer Styles to thicken your stroke by choosing Stroke at the bottom of the offered options, also here you can choose a blend mode, but for changing the thickness you can select where the stroke should be applied, so inside, outside and center, and when you choose Center and set the “Size” you can vary the thickness of the objects on that layer.
Layer style color overlay before activating, color is set to blue:
Layer style color overlay after activating, color is set to blue:
Layer style color overlay after selecting the color selector to change the colors and already have chosen a new color, every selection will be immediately shown (preview):
For the thickness, you could use “Stoke”.
Layer style stroke set to outside:
Layer style stroke set to center:
But you can also select your object and set in the Tool Options Docker a certain value in pixels that the selection will be larger and then and paint over this selection like this example shows:
Selection with Grow set to 10 pixel painted over selected area to show that it paints only in the selected area:
Selection with Grow set to 50 pixel painted over selected area to show that it paints only in the selected area:
You may want to take a look at our manual description of the user interface, as a start in understanding Krita, it is a well written an often highly informative source of information, not seldom you’ll find descriptions on things that go far above the use of Krita, for instance descriptions about workflows:
Michelist
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Thanks very much for all your expectations and the time you offered.
But for me this seems way too complicated. I am used to Affinity, where an object that I draw automatically keeps selected, so that I can change it’s colour/brush/size and the such.
I don’t know why this is so important for me, but I’m afraid I won’t get used to Krita.
I guess, if you stay with Krita for a while, and get accustomed to it, you will not want to miss it anymore. And with Krita it is nothing different as with buying a car or a new TV-Set, etc., those “things” will feel strange in the beginning phase, but there you even don’t think about “dropping them” because of this strange feeling, you will simply use them and get accustomed to them, and using Krita it is not different.
Hello @AhabGreybeard, 
Michelist
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As I understand it, Affinity is a vector based design application so you don’t actually ‘draw’ images, you create them using vector based tools.
@Michelist was describing methods and techniques suitable for raster image based drawings and paintings, which is what krita is mostly for.
Krita has vector based tools for use on specific vector layers (as opposed to raster layers) that are quite simple and not as extensively capable as specialised vector based applications.
Hello @Michelist
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Thank you ppl and I can understand that you like the software.
But for me it’s not fitting. I went over to Inkscape.
I have Affinity on my computer, I only need another software for my old laptop when the pc is busy with another family member 
If that is better suited for your use case, then it is the best decision you could make.
I wish you much fun using Inkscape!
Michelist
1 Like