I Can't Access Layers or Tools + Preview

I slid the windows containing the tools + preview and layers to the sides (fully) so I could focus on my project. When I needed them again, my cursor couldn't reach the windows, so I can't change the colour, layers and types of line, shape, etc. Any ideas on how to fix it? If it isn't fixed, I can't use the software anymore, even if I delete and redownload it (I tried that).